This book has five characteristics. First, mastering knowledge, skills, knowledge and skills is an important foundation for mathematics learning. Second, cultivate thinking ability, which is an essential quality in mathematics learning. Third, strengthen the sense of application, which closely links mathematics with life. Fourth, cultivate innovative consciousness, innovative consciousness, so that mathematics and creation have a voice. The last feature is to master the learning method, and the scientific method is the master key of mathematics learning. 53 All-pass coupons are moderately difficult. If children's academic performance and learning ability are below the average, then don't try the 53 All-Excellent Voucher, because this set of 53 All-Excellent Vouchers is a moderately difficult exercise paper, suitable for children with strong learning ability and strong understanding. In other words, children with good academic performance are only used to boost their grades. Therefore, it is slightly more difficult.